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Antibiotic Cephalexin 500mg

Brand names: Keflex, Cepcid, Cepmax, others.
Generic name: Cephalexin.
Available doses: 250mg, 500mg and 750mg.

Cephalexin inhibits the bacterial walls and has a bactericidal effect on a wide range of Gram-positive and Gram-negative microorganisms. Most strains of the following microorganisms are susceptible to cephalexin:

  • Gram-positive microorganisms: Staphylococcus (coagulase negative, coagulase positive and penicillinase-producing microorganisms), streptococci (enterococci are highly resistant to the drug), pneumococci
  • Gram-negative bacteria: E. coli, Salmonellae, Shigellae, Neisseria, Proteus mirabilis, various strains of Haemophilus (75%) and Klebsiella pneumonia (50%), pale spirochetes and actinomyces

Cephalexin is active against staphylococci producing penicillinase and resistant to penicillin and ampicillin. It is also active against the group A streptococci and diplococci resistant to tetracycline.
Enterococci are resistant to cephalexin. Cephalexin is not effective against Pseudomonas, Indole-positive proteus strains, Mycobacterium tuberculosis, anaerobic microorganisms.

Cephalexin Dosage

Cephalexin is recommended to be taken 30 to 60 minutes before meals with water. The maximum daily dose for adults is 6 grams, for children – 4 g. Cephalexin capsules should be taken 2 – 4 times a day.

Duration of the treatment is 7 – 14 days. In infectious diseases caused by Streptococcus, the treatment should continue for at least 10 days. In the treatment of chronic, recurrent and complicated urinary tract infections, the therapy should last for 14 days. The treatment should go on 2 days more after the disappearance of clinical symptoms.


Inform your doctor about whether you have allergic reactions to any medications (especially penicillins), kidney or liver, stomach or intestinal disorders.

Patients with allergy to penicillin derivatives of cephalosporin should use cephalexin cautiously due to a possibility of cross-reaction. It should be borne in mind that, in accordance with published data, there is a cross-allergy between penicillins and cephalosporins in hypersensitivity to penicillin in about 5-10% of patients. The treatment with cephalexin should be discontinued in the onset of allergic reactions, especially such as anaphylactic shock.

In patients with impaired renal function, it is possible a cumulative effect (requires correction of the dosage), thus cephalexin is prescribed with caution in small doses.

Alcohol must be avoided during the time of treatment. As with any oral antibiotic, there is a risk of development of secondary infections.

In a staph infection, there is a cross-resistance between cephalosporins and isoxazolyl penicillins.


Cephalexin antibiotic is intolerant to cephalosporins and antibiotics of a penicillin group, considering a possibility of a polyvalent allergy.

Cephalexin Side effects

Side effects of the gastrointestinal tract: dyspepsia, diarrhea, very seldom pseudomembranous colitis.
Other Cephalexin 500mg side effects: delicacy, tremor, giddiness, allergic reactions. These side effects are rare and usually disappear after the drug withdrawal. Severe side effects so far have not been reported.

Drug interactions

Cephalexin 500mg works fighting bacteria, that is why it is not recommended to use medications with similar action simultaneously. You should be very careful if Cephalexin antibiotic is used together with nephrotoxic drugs (aminoglycosides, polymyxin) and loop diuretics (Acidum ethacrynic, Furosemide).

Pregnancy and Breastfeeding

Despite the lack of data on the teratogenic effect of cephalexin, it should not be used during pregnancy. During the time of treatment, a woman should stop breastfeeding.

Missed Dose

In case of a missed dose, do not try to compensate in with an increased amount of Cephalexin 500mg. Simply wait until the next intake and have your regular dose.

What Is Cephalexin Price?

The price of Cephalexin 500mg or 250mg is different in various drugstores. Generally,  the cheapest Cephalexin price is in online pharmacies. Generic Cephalexin will cost you around $1.05 per pill if you order the largest package.

Buy Cephalexin online without prescription from us and get your medication delivered fast and discreetly. If your order Cephalexin 500mg or other antibiotics online in our pharmacy you will get a great discount for the next orders. Plus, buying generic Cephalexin 500mg makes you eligible to get our special bonus – free ED trial pack!

Cephalexin Reviews

K.T.: I have multiple allergies and every time I have to take a medication, I cringe in fear as I expect to start swelling in just a few minutes, but luckily, I am not allergic to antibiotics and have taken Cephalexin 500mg quite a few times with no problems whatsoever.

You often hear people talking how antibiotics should be avoided, but these are people that are simply misinformed – taking the antibiotics and Cephalexin 500mg, in particular, should be done responsibly, cleared with a doctor, and then they are just as safe as any other meds.

If you take any form of medication indiscriminately, of course, you can end up with problems and it doesn’t matter if they are antibiotics or not.

Anyway, on the subject of Cephalexin 500mg – very powerful and work really quickly and if you take them often (for stubborn infections), then make sure to buy the generics online as you’ll pay less.

Alex, NY: The first time I took Cephalexin 500mg was for bronchitis and it was prescribed by my doctor (together with another drug) and the cocktail worked like magic.

Only three days after I took the first capsule I was like brand new and although I had to take the pills a little longer (my doctor’s orders) they did what they were supposed to.
Brian, UK: Sometime last winter I started going to the bathroom often and I had the feeling that something wasn’t right, but I went to see my GP only after my urine came out reddish.

She asked me for a urine sample and the test showed that I had UTI for which I was prescribed Cephalexin 500mg (Keflex).

The urge to urinate often and the little burning sensation that I had disappeared two days after I started taking the meds and the only bad reaction that I had wa diarrhea, but that might not have been caused by the antibiotic at all.

G.H.: Cephalexin 500mg is the only antibiotic that helps me with my sinus problems and since these problems seem to reoccur, I started buying the generic Cephalexin 500 mg off the Internet and right now I am well stocked.

As I said, this is the only antibiotic that actually works for me and I must have tried at least ten others, so if you have similar problems see if your doctor thinks that this drug might help you out and give it a try.